diff --git a/docs/体系结构/N2T.md b/docs/体系结构/N2T.md
index f2a629f3..6aba15f9 100644
--- a/docs/体系结构/N2T.md
+++ b/docs/体系结构/N2T.md
@@ -18,7 +18,7 @@
 
 - 课程网站：[Nand2Tetris I](https://www.coursera.org/learn/build-a-computer/home/week/1), [Nand2Tetris II](https://www.coursera.org/learn/nand2tetris2/home/welcome)
 - 课程视频：详见课程网站
-- 课程教材：[计算机系统要素：从零开始构建现代计算机](book)
+- 课程教材：[计算机系统要素：从零开始构建现代计算机][book]
 - 课程作业：10 个 Project 带你造台计算机，具体要求详见课程网站
 
 [book]: https://github.com/PKUFlyingPig/NandToTetris/blob/master/%5B%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%B3%BB%E7%BB%9F%E8%A6%81%E7%B4%A0%EF%BC%9A%E4%BB%8E%E9%9B%B6%E5%BC%80%E5%A7%8B%E6%9E%84%E5%BB%BA%E7%8E%B0%E4%BB%A3%E8%AE%A1%E7%AE%97%E6%9C%BA%5D.(%E5%B0%BC%E8%90%A8).%E5%91%A8%E7%BB%B4.%E6%89%AB%E6%8F%8F%E7%89%88.pdf
diff --git a/docs/必学工具/tools.md b/docs/必学工具/tools.md
index 910c8c5e..5db9dcc2 100644
--- a/docs/必学工具/tools.md
+++ b/docs/必学工具/tools.md
@@ -24,6 +24,7 @@
 - [turbosquid](https://www.turbosquid.com/): 可以购买各式各样的模型。
 - [flaticon](https://www.flaticon.com/): 可下载免费且高质量的图标。
 - [标准地图服务系统](http://bzdt.ch.mnr.gov.cn/): 可以下载官方标准地图。
+- [PlantUML](https://plantuml.com/zh/): 可以使用代码快速编写 UML 图。
 
 ## 编程相关
 
diff --git a/overrides/main.html b/overrides/main.html
index e7c8cffe..a82028c2 100644
--- a/overrides/main.html
+++ b/overrides/main.html
@@ -3,11 +3,19 @@
 {% block disqus %}
 <script src="https://giscus.app/client.js" data-repo="PKUFlyingPig/cs-self-learning" data-repo-id="R_kgDOGP67ng"
     data-category="Announcements" data-category-id="DIC_kwDOGP67ns4COM9Q" data-mapping="title"
-    data-reactions-enabled="1" data-emit-metadata="0" data-input-position="top" data-theme="light" data-lang="zh-CN"
-    data-loading="lazy" crossorigin="anonymous" async>
+    data-reactions-enabled="1" data-emit-metadata="0" data-input-position="top" data-theme="light_protanopia"
+    data-lang="zh-CN" data-loading="lazy" crossorigin="anonymous" async>
 </script>
 
 <script>
+    var palette = __get("__palette")
+    if (palette && typeof palette.color === "object") {
+        if (palette.color.scheme === "slate") {
+            const giscus = document.querySelector("script[src*=giscus]")
+            giscus.setAttribute("data-theme", "dark_protanopia")
+        }
+    }
+
     document.addEventListener("DOMContentLoaded", function () {
         const ref = document.querySelector("[data-md-component=palette]")
         ref.addEventListener("change", function () {